Legal zm_app7e_betterbworld_jdfix_v3

Had a discussion well playing whether or not this spot was illegal. I have been under the impression that its legal because as one person you cant hold it off with the back wall broken and with 2 one of them is going to be close enough to knife without having to crouch into the spot. I would like some clarification.

I tested it out myself, it takes a few knives for the wall to break and you can certainly stack outside to reach a CT or fall and slide into the hole...I always thought multiple entrances=legal, even if there's a crouch entry?